1 // SPDX-License-Identifier: GPL-2.0+
5  *	(c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
10  *	"AS-IS" and at no charge.
44 #include <linux/io.h>
71 /* You must set these - there is no sane way to probe for this board. */
72 static int io = 0x240;  variable
77 module_param_hw(io, int, ioport, 0);
78 MODULE_PARM_DESC(io, "WDT io port (default=0x240)");
82 /* Support for the Fan Tachometer on the WDT501-P */
86 		"WDT501-P Fan Tachometer support (0=disable, default=0)");
91 		"WDT501-P Card type (500 or 501, default=500)");
130 	wdt_ctr_load(2, 65535);		/* Length of reset pulse */  in wdt_start()
148 	wdt_ctr_load(2, 0);		/* 0 length reset pulses now */  in wdt_stop()
166 	wdt_ctr_mode(1, 2);		/* Re-Program CTR1 for Mode 2:  in wdt_ping()
178  *	value is incorrect we keep the old value and return -EINVAL. If
185 		return -EINVAL;  in wdt_set_heartbeat()
252 		pr_crit("Overheat alarm (%d)\n", inb_p(WDT_RT));  in wdt_decode_501()
254 		pr_crit("PSU over voltage\n");  in wdt_decode_501()
256 		pr_crit("PSU under voltage\n");  in wdt_decode_501()
280 	pr_crit("WDT status %d\n", status);  in wdt_interrupt()
286 				pr_crit("Possible fan fault\n");  in wdt_interrupt()
292 		pr_crit("Would Reboot\n");  in wdt_interrupt()
294 		pr_crit("Initiating system reboot\n");  in wdt_interrupt()
298 		pr_crit("Reset in 5ms\n");  in wdt_interrupt()
330 					return -EFAULT;  in wdt_write()
377 		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;  in wdt_ioctl()
388 			return -EFAULT;  in wdt_ioctl()
390 			return -EINVAL;  in wdt_ioctl()
396 		return -ENOTTY;  in wdt_ioctl()
408  *	triggers counter 2 downcounts the length of the reset pulse which
415 		return -EBUSY;  in wdt_open()
441 		pr_crit("WDT device closed unexpectedly.  WDT will not stop!\n");  in wdt_release()
465 		return -EFAULT;  in wdt_temp_read()
505  *	trust me - if it happens it does suck.
575 	release_region(io, 8);  in wdt_exit()
591 		pr_err("unknown card type '%d'\n", type);  in wdt_init()
592 		return -ENODEV;  in wdt_init()
596 	   if not reset to the default */  in wdt_init()
599 		pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",  in wdt_init()
603 	if (!request_region(io, 8, "wdt501p")) {  in wdt_init()
604 		pr_err("I/O address 0x%04x already in use\n", io);  in wdt_init()
605 		ret = -EBUSY;  in wdt_init()
611 		pr_err("IRQ %d is not free\n", irq);  in wdt_init()
617 		pr_err("cannot register reboot notifier (err=%d)\n", ret);  in wdt_init()
624 			pr_err("cannot register miscdev on minor=%d (err=%d)\n",  in wdt_init()
632 		pr_err("cannot register miscdev on minor=%d (err=%d)\n",  in wdt_init()
637 	pr_info("WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n",  in wdt_init()
638 		io, irq, heartbeat, nowayout);  in wdt_init()
640 		pr_info("Fan Tachometer is %s\n",  in wdt_init()
652 	release_region(io, 8);  in wdt_init()